缝洞型潜山油藏储量计算方法研究

缝洞型潜山油藏具有特殊的储集类型和特征,其饱和度参数解释、有效厚度划分、储层平面分布的确定是储量计算中的难题。利用成像、核磁共振测井资料,对东部的埕岛油田埕北30块缝洞型潜山油藏,定量描述其裂缝、计算裂缝孔隙度和解释含油饱和度,将测井与地震资料相结合,确定井点以外储量参数分布;对西部的塔河油田塔3,4块油藏,针对缝洞型油藏的储量不确定性,采用容积法、动态法、概率统计法多种方法计算储量,并给出了储量的期望值。通过对东、西部缝洞型潜山油藏采用的不同储量计算方法对比分析,形成了一套适合于该类油藏储量参数研究和储量计算的方法。经过开发井资料进一步证实,该方法计算的储量具有较高的精度。

Studies on reserve calculation method for fractured-vuggy reservoir of buried hill

The fractured-vuggy reservoir of buried hill has special storage space and reservoir characteristics.The interpretation of fracture and vuggy saturation,the determination of effective thickness and the distribution of reservoir are the main problems in reserve calculation.Formation microscanner images(FMI) and nuclear magnetic resonance(NMR) were used to describe fracture quantitatively,calculate fracture porosity and interpret oil saturation in the Chengbei 30 buried hill reservoir.In conjunction with seismic data,well logging was used to determine the distribution of reserve parameters out of well site.For the reserve uncertainty of the fractured-vuggy reservoir,the reserves of Ta 3 & Ta 4 buried-hill reservoirs in the Tahe Oilfield of western China were calculated by the volumetric method,dynamic method and probability statistics method and so on.And the expectation of reserve was obtained.By comparing the reserve calculation method of western buried-hill reservoirs with that of eastern ones,a suit method which is fit to research the reserve parameters and calculate reserve for the class reservoirs was formed.The data of development proved that this method can be used to calculate reserve with high accuracy.